I originally bought the Moto E4 Plus (from Amazon w/ Special Offers) for my boy to use on Republic Wireless. WiFi Calling worked there but ever since I switched to Mint I haven't been able to get it working again. WiFi Calling is enabled on the account and under the settings on the phone. WiFi Calling through Mint works just fine on my Moto X4. Does anybody have any suggestions or do you have the same phone and can verify whether or not WiFi Calling is working?